Sorry was not keeping an eye on this, yes I have 2 or 3 in stock at the moment and I also have a couple for 4200 looking for a test vehicle. In terms of passing on the information on how i made it, I got a reputable rotary sensor manufacturer to make a contact free optical sensor with identical outputs to the analogue Bosch unit and then designed a series of machined parts to create the rotary coupling, used a precision sealed rotary bearing for the main sensor shaft suspension, had a spring company make up some springs for the return, worked out angles and end stops and had a machine shop make all the machined parts, assembled them, worked out what didn't work and made some more, and now have a design which seems to work well. The 4200 version is the same mechanical outline but has different electrical outputs. I hope this explains it?